/Engine/Source/Runtime/Engine/Classes/GameFramework/OnlineReplStructs.h
Makes sure that the opaque aspects ofFUniqueNetIdare properly handled/serialized over network RPC and actor replication
struct FUniqueNetIdRepl : public [FUniqueNetIdWrapper](API\Runtime\CoreOnline\Online\FUniqueNetIdWrapper)
TArray< uint8 >
ReplicationBytes
Network serialized data cache